Adjustable support for electric lamps



ne 3; 1930. J. P. JOHAN-SSON 6 ,8

ADJUSTABLE SUPPORT FOR ELECTRIC LAMPS Filed Nov. 4, 1927 2 Sheets-Sheet 1 luvslv'rog Jon/m P. JOHANSSQN A'rroRNE June 3, 1930. JOHANSISQN 1,761,832

ADJUSTABLE SUPPORT FOR ELECTRIC LAMPS Filed Nov. 4, 192'! z Sheets-Sheet 2 I VENTOK JOHAH P- JOHANSSON AmznEY Patented June 3, 1930 i j UNITED. STATES PATENT OFFICE :ronAn BETTER JoHAN'sson, or ENKOPING, SWEDEN of these joints, and the purpose of the invention is to provide a stable structure, in which the electric wires are well protected and at the same time alldanger of breaking or twisting the wires, when adjusting the rotary joints or the telescopic stem, is avoided.

, The annexed drawings show an ment of the invention.

' Figs- 1 and 2 show the support in its entirety in two side views. 1 Fig. 3 shows a section through the top part of the support on a larger" scale and. Fig. shows. a section through a part of Fig. 3 on a still larger scale.

1 Referring to Figs. 1 and 2, the support consists of a plate 1, adapted to be attached to a ceiling, a wall or the like, abracket 2 rigidly fixed to said plate, a'holder 4 mountedto r'otate in said bracket, a pair of discs 5,6 fixed to said holder, a cover 9 rotating insaid discs, a telescopicstem.10,"11,'12attached to said cover 9 and a rotary joint 13' detachably mounted in the outer end of the telescopic emboditube 12 andiconnected with the holder of the ing the top parts 1, 2, 4,5 and 9 willnow be described with reference to Figs. 3 and 4. 1 is the plate, '2 the bracket attached thereto and 4 the holder; This holder 4 is rotatably mounted at the bracket 2 by means ofzan annular disc'3 attached to the holder 4, said disc being pressedagainst the bracket 2 by means of a disc 49 which, in its turn, is acted upon. by a disc provided with set-screws '51 acting upon the opposite side of the bracket 2. -Washers 47, 48 of a suitable material,,-for instance fiber, are inserted between I the bracket 2 and the disc 3 and between the disc 3'and the disc 49.

The centre of motion of the holder 4 has attached toit one ball-race 23 ofa double row thrust-bearing the second ball-race 20 of which is prevented from turning in relation ADJUSTABLE SUPPORT FOR ELECTRIC LAMPS Application filed November 4, 1927'.v Serial no. 231,047.

to the bracket 2 by means of a projection or stem 22 extending from the disc 50 into a slot 75 located in the ball-race v 20. The double row thrust-bearing is positioned by a bolt 61 screwed in the holder 4 on which bolt the ball-race 20 is rotatably mounted by means of a bush 76 placed on the bolt. The inner end of said bush rests against the ballrace 23 while the outer end is actedupon by a sleeve 80 joining the ball-races 20, 23 so that'the ball-race 23 is pressed against the holder 4. To ensure a sufficient friction between the ball-race 23 and theholder 4 a washer 62 of rubber or the like is inserted between these two parts. i

l The ball-races 20 and 23 are carried out in china or. any other insulating material and are each provided with two concentric metallic contact-rings 52, 53 and 58, 59 respectively, against which the two ball-rows 21 tween the ball-rows 21 and the rings 52, 53.

Each ring 52, 53 is,'further, connected with a terminal 54 and 55 respectively in order to connect. the two wires 77, 7 8- of the double strand 17. is a ball cage, of fiber or the like. The double strand 17 is, as shown, inserted fromthe top side of the plate 1, at whichplace it is connected with the network 15 by a plug switch 16 or the like. From the topside of the'plate the double strand 17 is drawn through an .aperture 18 in the plate 1 and the bracket-2 to be extended along the outside of the bracket 2 and connectedwith the terminals 54, 55. To protect the strand 17 on the course between theplate 1 and its terminals as well as to protect the ball-bearing 20, 21,23 a protecting cover 19 is screwed at the back side of the bracket 2. 7

Fixed to the holder 4 is a pair of rings 5 and 6 having circular friction faces. These rings rest, by means of fiber discs 45, 46 against a pair of rings 7 and 8, which form the end-walls of the cover 9,. To obtain an adjustable friction between the rings 5, 6 on one hand and the rings 7, 8 on the other hand there is a bolt 37 arranged, having its ends providedlWit-h nuts; offwhich' one nut 41 lastinentionedone is'provided With a lateral projection 25, n h ich serves to cover the W re 24 extendin iron} the ballerace 23,sa1d-w1re 2-4 having its other end drawn through the central aperture of the ring 8 and connected Withthe terminalsf26, 2,7, Wh ch arefiz zed 1n 'the oneof the ball-races 28, 30 of a-doublerow ball-bearing 28, 29;;30 of a'design similar;

to the ball-bearingQO, 21, 23 and placed on r the bolt 37 On the bolt 37 a 'W1nd1ng5up p drum :33 is, also, rotatably mounted by means ofaf'ball-bearing 36. The-b llmace, 28' is rigidly. fixed' to the bolt 37, while the ball-' race 30 isrigidly'connected with the drum 33.

- One end of the strand iil, Wound up: on the drfurn 33, has "the one conductor connected with the terminal 31; hile the se'cond'con ductor i's connected ivith the terminal r32. 2 Thewother "end ofthe strand 34 isudrawn V througlithetube 10, connected with the cover orcasing lh Inorder to obtain anautorhaticwin ding' lip :ofthestrand 3% on the Vd'ruin 38, this drum is; acted upon by aspiral spring one end of whichis' fixed to the'bolt 37 n eans of i the part 39 While the" other end 1S1 connected ivith the drum bymeans of thepin 40L a c Having now part'cullrly describedthe nature ofiny invention and the 'manneroi lts operation, What lclairn is:

1. Adjustable up port for electriolainps V '7 7 in rehichthe lamp is supported byatelescopic. tube connected With a rotary "frlOt1QIl ";]O ].Iltwh-iehtie connected with a second-jflrlctlon joint arranged.- in right anglestoYthe first friction'joint characterizedby the the. first friction'joint ishollowand contains a; spring-actuated inding-up drum for an electric two-Wire strand extending through the telescopic tube j V v I I 2; Adjustablesupport forjelectrlc' lamps in which the lamp is supported by a telescopic tube connected with a'rotar5' triction oint which is connected Witha "second friction joint 'arrangedflin right angles to the first fir-iction oint'characterized by the fact that thefirst friction j'ointis hollow and contains a springractuated winding up drum for an electric two-Wire strand extending through theteleecopic tube, the twoire strand on the Winding-up dru ;b in connected with 7 one side ofa double-rowball bearlng through which the electric ourrentis transported and froni the otheri'side of which ball-bearing the current in another two-Wire strand leads turf ther to the secon d'friction joint; '1 I Adjustable; support for electr c lamps in which the lamp is supported by a telescopic tube, connected; with; a rotary friction joint which" "is connected With a second' friction' joint "arranged inrig'ht angles" tojthe first :tro'u the. other side of which ballfbearing the currentin another two-wire strand leads fur- "tlIer to the secondfriction'joint, in 'which also i aldouble-row balltbearing is mounted. V V c j lfAdjustable support for; electric lamps" which theilamp, issupported by a telescopic; tubeconnected with a rotary friction joint which is connectedwith.avvfs eco-ndfriction 'i joint arranged in right angles- 1 50 the first friction jointfcharacterizediby the, fact that c the'first friction joint-is hollow andf'contai'ns V ,spring-actuated winding upfdrum for an. electric two wire strand-extending through i the telescopic tube, thatpart ofthe first'fri'c tion jOlill7,-WVl1lCl1 is connected with the tale;

scopic tube, forming la. hollow body having 5. Adj ustable support -for electric ing-Q throu press on the fr ction surfaces? 1 6. A universal supportingelectrie fixturei comprising'aplatefor attachment, a bracket l I integral with and perpendiculartosaidp'late;- a holder rotatablymountedzinisaid bracket, a v ,7 v p ir ofdiscs"positioned;,in';spacedrelation on1 f" s aid hold'er, a cover'rotatably nounted be- 7 1 ,i tweensaidpair of discs; containing aslpring c actuated druni.coeaxial therewith, an electric strand woundupon said drum; a. first rolling? electrical {contact nieans betweert said drum and} saidjcover-and' a secondrolling;electrical:

contactnieans'between:saidiholde'r"and said bracket connected to first rollingelectri cal contact ineansandgs'aid -strand Y 1 V 7. A universalsupporting electric I fixture: con'iprisingaplate, for-"attacl1rnentl a bracket; integral With-and perpendicular'to said plate; i l a ho'ld'er rotatably niouiited insaid braclret, a pair of discs;positionecl inspace'direlationon: J saidholtler," cover rotatably inounted between said'pair of discs con-taining'aTspriiig actuated drum" ConiaLthereWithQ an ,;electric 1* v strand wound upon said druin', a first rolling lamps I f in which the-lampissupported by'at'elescopic tube i connected" with aiirotary friction "j oint which' gis connected With-a'second fricticn .1, joint-arranged iirright:anglesto thefi'rst'fric Y c tion jQ'i'nt charactfirizedibj the factfthat the i? first friction iointjs hollow land-1 contains a; spring actnated yvinding-up;drurn foran elec'i-Z'F: v ti ietwowireistrandextending through t-he r te'ljescopi c-L'tnbe;that partfotthe first friction 7 oint; which is connected {with the telescopic tube; forming ahollow body having two an, I i

' nul-ar friction -sijirf acs} iarranged on, each sideaof the telescopic tuhe,*andaiscrew lead- 

